/Engine/Source/Runtime/MediaUtils/Public/MediaSampleCache.h
GetOverlaySamples
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IMediaTextureSample](API\Runtime\Media\IMediaTextureSample), ESPMode::ThreadSafe > GetVideoSample ( [FTimespan](API\Runtime\Core\Misc\FTimespan) Time, bool Forward )